My late October build 1970 Challenger lacked the T/A spoiler holes.
This pic is from an August 26th 1969 Challenger (thank u cataclysm80)
and is identical to my October 6th SPD except mine is missing the large hole on the bottom rt side for the luggage rack.
My lid also lacks the two small slots/small holes on each side for the wing spoiler brackets.
Looks like there were many variations of holes in the Challenger trunk lids. From the evidence I have seen, The T/A spoiler holes stayed until about the end of the 71 model year/early 72 and were gone pretty much for the 1972's on.